Class: Audrey::Engine::SQLite3

Inherits:
Audrey::Engine show all
Extended by:
Forwardable
Defined in:
lib/audrey/engine/sqlite3.rb

Overview

Audrey::Engine::SQLite3

Defined Under Namespace

Modules: Init Classes: Importer, Query, Transaction

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(p_path, p_mode, opts = {}) ⇒ SQLite3

initialize



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# File 'lib/audrey/engine/sqlite3.rb', line 19

def initialize(p_path, p_mode, opts={})
  # default options
  opts = {'immediate_commit'=>true}.merge(opts)
  
  # set some properties
  @path = p_path
  @immediate_commit = opts['immediate_commit'] ? true : false
  @preps = {}
  @mode = p_mode
  
  # KLUDGE: For now, default to partition 'm'
  @partition = 'm'
  
  # lock file
  set_lock()
  
  # if file exists
  existed = File.exist?(@path)
  
  # open database handle
  @dbh = get_dbh()
  
  # custom functions
  custom_functions()
  
  # create and structure database if the file doesn't exist
  if not existed
    require 'audrey/engine/sqlite3/init'
    Audrey::Engine::SQLite3::Init.build @dbh
  end
  
  # transactions
  @transactions = []
  
  # initial transaction
  if @immediate_commit
    @transactions.push Audrey::Engine::SQLite3::Transaction::AutoCommit.new(self)
  else
    @transactions.push Audrey::Engine::SQLite3::Transaction::RC.new(self)
  end
  
  # create stuff just for this session
  self.class.session_tables @dbh
end

Instance Attribute Details

#dbh ⇒ Object (readonly)

Returns the value of attribute dbh.



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# File 'lib/audrey/engine/sqlite3.rb', line 8

def dbh
  @dbh
end

#partition ⇒ Object

Returns the value of attribute partition.



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# File 'lib/audrey/engine/sqlite3.rb', line 12

def partition
  @partition
end

#path ⇒ Object (readonly)

Returns the value of attribute path.



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# File 'lib/audrey/engine/sqlite3.rb', line 10

def path
  @path
end

#preps ⇒ Object (readonly)

Returns the value of attribute preps.



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# File 'lib/audrey/engine/sqlite3.rb', line 11

def preps
  @preps
end

#transactions ⇒ Object (readonly)

Returns the value of attribute transactions.



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# File 'lib/audrey/engine/sqlite3.rb', line 9

def transactions
  @transactions
end

Instance Method Details

#add_relationship(parent_pk, child_pk, opts = {}) ⇒ Object

add_relationship



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# File 'lib/audrey/engine/sqlite3.rb', line 515

def add_relationship(parent_pk, child_pk, opts={})
  # ensure prepared statement
  if not @preps['add_relationship']
    sql = "    insert into relationships(pk, parent, child, ord, hkey)\n      values(\n        :pk,\n        :parent,\n        :child,\n    \n        case\n          when :ord is null then\n            coalesce((select max(ord) from relationships where parent=parent), 0) + 1\n          else :ord\n        end,\n    :hkey)\n    SQL\n    \n    @preps['add_relationship'] = @dbh.prepare(sql)\n  end\n  \n  # uuid for new relationship record\n  pk = Audrey::Util.uuid\n  \n  # execute\n  begin\n    @preps['add_relationship'].execute(\n      sql,\n      'pk'=>pk,\n      'parent'=>parent_pk,\n      'child'=>child_pk,\n      'ord'=>opts['ord'],\n      'hkey'=>opts['hkey']\n    );\n  ensure\n    @preps['add_relationship'].reset!\n  end\n  \n  # return\n  return pk\nend\n"

#add_xt(obj_pk, xt_pk) ⇒ Object

add_xt



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# File 'lib/audrey/engine/sqlite3.rb', line 461

def add_xt(obj_pk, xt_pk)
  # $tm.hrm
  
  # prepare insert statement if necessary
  if not @preps['insert_xt']
    sql = "    insert into objects(pk, partition, bclass, fclass)\n    values(?, (select partition from objects where pk=?), 'Audrey::Object::Hash', 'xt')\n    SQL\n    \n    @preps['insert_xt'] ||= @dbh.prepare(sql)\n  end\n  \n  # create xt\n  simple_exec @preps['insert_xt'], xt_pk, obj_pk\n  \n  # associate record\n  @preps['add_xt'] ||= @dbh.prepare('update objects set xt=:xtpk where pk=:pk and partition=:partition')\n  simple_exec @preps['add_xt'], 'xtpk'=>xt_pk, 'pk'=>obj_pk, 'partition'=>@partition\nend\n"

#ancestors(child_pk) ⇒ Object

ancestors



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# File 'lib/audrey/engine/sqlite3.rb', line 959

def ancestors(child_pk)
  # sql to add parents
  if not @preps['ancestors']
    sql = "    select *\n      from objects where pk in (\n        with recursive\n          ancestors(c) as (\n            values(:child_pk)\n            union\n            select parent from relationships, ancestors\n            where relationships.child=ancestors.c\n          )\n        select parent from relationships\n          where relationships.child in ancestors\n    );\n    SQL\n    \n    @preps['ancestors'] = @dbh.prepare(sql)\n  end\n  \n  # loop through results\n  @preps['ancestors'].execute('child_pk'=>child_pk).each do |row|\n    yield row\n  end\nensure\n  @preps['ancestors'] and @preps['ancestors'].reset!\nend\n"

#array_each(parent_pk) ⇒ Object

array_each



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# File 'lib/audrey/engine/sqlite3.rb', line 899

def array_each(parent_pk)
  # $tm.hrm
  
  # ensure statement handle
  if not @preps['array_each']
    sql = "    select r.ord as ord, o.*\n    from relationships r, objects o\n    where r.parent=:parent and o.pk=r.child\n    order by r.ord\n    SQL\n    \n    @preps['array_each'] = @dbh.prepare(sql)\n  end\n  \n  # loop through records\n  @preps['array_each'].execute('parent'=>parent_pk).each_hash do |row|\n    yield row\n  end\nensure\n  @preps['array_each'] and @preps['array_each'].reset!\nend\n"

#changed_get(pk) ⇒ Object

changed_get



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# File 'lib/audrey/engine/sqlite3.rb', line 794

def changed_get(pk)
  # $tm.hrm
  
  # prepare
  @preps['changed_get'] ||= @dbh.prepare('select changed from objects where pk=:pk')
  
  # execute
  @preps['changed_get'].execute('pk'=>pk).each_hash do |row|
    return row['changed']
  end
ensure
  @preps['changed_get'] and @preps['changed_get'].reset!
end

#changed_objects ⇒ Object

changed_objects



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# File 'lib/audrey/engine/sqlite3.rb', line 1019

def changed_objects
  # $tm.hrm
  
  # sql to add parents
  if not @preps['changed_objects']
    sql = "    select *\n      from objects\n    where\n      changed and\n      custom_class(fclass)\n    order by\n      changed\n    SQL\n    \n    @preps['changed_objects'] = @dbh.prepare(sql)\n  end\n  \n  # loop through results\n  @preps['changed_objects'].execute().each do |row|\n    yield row\n  end\nensure\n  @preps['changed_objects'] and @preps['changed_objects'].reset!\nend\n"

#changed_set(pk, bool) ⇒ Object

changed_set



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# File 'lib/audrey/engine/sqlite3.rb', line 815

def changed_set(pk, bool)
  # $tm.hrm
  
  # set to changed
  if bool
    @preps['changed_set_true'] ||= @dbh.prepare('update base_objects set changed=current_timestamp where pk=:pk') 
    simple_exec @preps['changed_set_true'], 'pk'=>pk
  else
    @preps['changed_set_false'] ||= @dbh.prepare('update base_objects set changed=null where pk=:pk') 
    simple_exec @preps['changed_set_false'], 'pk'=>pk
  end
end

#clear_collection(parent_pk) ⇒ Object

clear_collection



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# File 'lib/audrey/engine/sqlite3.rb', line 777

def clear_collection(parent_pk)
  # $tm.hrm
  
  # prepare
  @preps['clear_collection'] ||= @dbh.prepare('delete from relationships where parent=:parent')
  
  # execute
  simple_exec @preps['clear_collection'], 'parent'=>parent_pk
end

#close(opts = {}) ⇒ Object

close



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# File 'lib/audrey/engine/sqlite3.rb', line 190

def close(opts={})
  # $tm.hrm
  
  # close prepared statements
  @preps.keys.each do |key|
    stmt = @preps[key]
    
    if stmt and (not stmt.closed?)
      stmt.close
    end
    
    @preps.delete key
  end
  
  # purge
  if opts['purge']
    purge()
  end
  
  # close database handle
  if not @dbh.closed?
    @dbh.close
  end
  
  # unlock file
  if @lock
    @lock.flock File::LOCK_UN
    @lock.close
  end
end

#collection_child_pks(parent_pk) ⇒ Object

collection_child_pks



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# File 'lib/audrey/engine/sqlite3.rb', line 835

def collection_child_pks(parent_pk)
  # $tm.hrm
  
  # prepare
  if not @preps['collection_child_pks']
    sql = "    select child\n    from relationships\n    where parent=:parent\n    SQL\n    \n    @preps['collection_child_pks'] ||= @dbh.prepare(sql)\n  end\n  \n  # init\n  rv = []\n  \n  # get count\n  @preps['collection_child_pks'].execute(parent_pk).each_hash do |row|\n    rv.push row['child']\n  end\n  \n  # return\n  return rv\nensure\n  @preps['collection_child_pks'] and @preps['collection_child_pks'].reset!\nend\n"

#collection_length(parent_pk) ⇒ Object

collection_length



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# File 'lib/audrey/engine/sqlite3.rb', line 870

def collection_length(parent_pk)
  # $tm.hrm
  
  # prepare
  if not @preps['collection_length']
    sql = "    select count(*) as count\n    from relationships\n    where parent=:parent\n    SQL\n    \n    @preps['collection_length'] ||= @dbh.prepare(sql)\n  end\n  \n  # get count\n  @preps['collection_length'].execute(parent_pk).each_hash do |row|\n    return row['count']\n  end\nensure\n  @preps['collection_length'] and @preps['collection_length'].reset!\nend\n"

#commit ⇒ Object

commit, rollback



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# File 'lib/audrey/engine/sqlite3.rb', line 92

def commit
  return @transactions[0].commit
end

#custom_functions ⇒ Object

custom_functions



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# File 'lib/audrey/engine/sqlite3.rb', line 228

def custom_functions()
  #-----------------------------------------------------------------------
  # partition
  #
  @dbh.create_function('current_partition', 0) do |func|
    func.result = @partition
  end
  #
  # partition
  #-----------------------------------------------------------------------
  
  
  #-----------------------------------------------------------------------
  # insert_object_journal
  #
  @dbh.create_function('insert_object_journal', 4 ) do |func, partition, root, fclass, scalar, xt|
    # $tm.hrm
    
    # translate scalars to objects for storage in JSON
    if converter = Audrey::AUDREY_SCALAR_TO_RUBY[fclass]
      scalar = converter.call(scalar)
    end
    
    # initialize
    rv = {}
    rv['fc'] = fclass
    rv['pt'] = partition
    
    # scalar
    if rv['s'].is_a?(String)
      rv['s'] = scalar.force_encoding('UTF-8')
    end
    
    # xt
    if xt
      rv['xt'] = xt
    end
    
    # root
    if root == 1
      rv['root'] = true
    end
    
    # set return result
    func.result = JSON.generate(rv)
  end
  #
  # insert_object_journal
  #-----------------------------------------------------------------------
  
  
  #-----------------------------------------------------------------------
  # fclass_fco, fclass_isolate
  #
  @dbh.create_function('fclass_fco', 1) do |func, fclass|
    func.result = Audrey::Util.fclass_fco(fclass) ? 1 : 0
  end
  
  @dbh.create_function('fclass_isolate', 1) do |func, fclass|
    func.result = Audrey::Util.fclass_isolate(fclass) ? 1 : 0
  end
  #
  # fclass_fco, fclass_isolate
  #-----------------------------------------------------------------------
  
  
  #-----------------------------------------------------------------------
  # graph_field
  #
  @dbh.create_function('graph_field', 2) do |func, fclass, hkey|
    func.result = Audrey::Util.graph_field?(fclass, hkey) ? 1 : 0
  end
  #
  # graph_field
  #-----------------------------------------------------------------------
  
  
  #-----------------------------------------------------------------------
  # change_to_true
  #
  # @dbh.create_function('change_to_true', 1) do |func, fclass|
  #  func.result = 1
  # end
  #
  # change_to_true
  #-----------------------------------------------------------------------
  
  
  #-----------------------------------------------------------------------
  # custom_class
  #
  @dbh.create_function('custom_class', 1) do |func, fclass|
    func.result = Audrey::Util.custom_class?(fclass) ? 1 : 0
  end
  #
  # custom_class
  #-----------------------------------------------------------------------
  
  
  #-----------------------------------------------------------------------
  # debug
  #
  @dbh.create_function('debug', 1) do |func, msg|
    puts msg
    func.result = 1
  end
  #
  # debug
  #-----------------------------------------------------------------------
end

#delete_object(pk) ⇒ Object

delete_object



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# File 'lib/audrey/engine/sqlite3.rb', line 437

def delete_object(pk)
  # $tm.hrm
  
  # ensure statement handle
  if not @preps['delete_object']
    sql = "    delete from objects\n    where pk=:pk and partition=:partition\n    SQL\n    \n    @preps['delete_object'] = @dbh.prepare(sql)\n  end\n  \n  # execute\n  simple_exec @preps['delete_object'], 'pk' => pk, 'partition' => @partition\nend\n"

#get_dbh ⇒ Object

get_dbh



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# File 'lib/audrey/engine/sqlite3.rb', line 71

def get_dbh
  # get database handle
  rv = ::SQLite3::Database.new(@path)
  
  # enforce referential integrity
  rv.execute 'pragma foreign_keys=on'
  
  # results as hash
  rv.results_as_hash = true
  
  # return
  return rv
end

#get_xt(obj_pk) ⇒ Object

get_xt



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# File 'lib/audrey/engine/sqlite3.rb', line 489

def get_xt(obj_pk)
  # prepare statement if necessary
  @preps['existing_xt'] ||= @dbh.prepare('select xt from objects where pk=:pk and partition=:partition')
  
  # search
  @preps['existing_xt'].execute('pk'=>obj_pk, 'partition'=>@partition).each do |row|
    return row['xt']
  end
  
  # create
  xt_pk = Audrey::Util.uuid
  add_xt obj_pk, xt_pk
  
  # return
  return xt_pk
ensure
  @preps['existing_xt'] and @preps['existing_xt'].reset!
end

#hash_each(parent_pk) ⇒ Object

hash_each



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# File 'lib/audrey/engine/sqlite3.rb', line 725

def hash_each(parent_pk)
  # $tm.hrm
  rv = nil
  
  # loop through keys
  hash_keys(parent_pk).each do |key|
    if block_given?
      yield key, row_hash_by_key(parent_pk, key)
    else
      rv ||= []
      rv.push [key, row_hash_by_key(parent_pk, key)]
    end
  end
  
  # return
  return rv
end

#hash_element_delete(parent_pk, key) ⇒ Object

hash_element_delete



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# File 'lib/audrey/engine/sqlite3.rb', line 634

def hash_element_delete(parent_pk, key)
  # $tm.hrm
  
  # get record
  record = row_hash_by_key(parent_pk, key)
  
  # execute
  if record
    if not @preps['delete_hash_key']
      sql = "      delete from relationships\n      where parent=:parent and hkey=:hkey\n      SQL\n      \n      @preps['delete_hash_key'] = @dbh.prepare(sql)\n    end\n    \n    simple_exec @preps['delete_hash_key'], 'parent'=>parent_pk, 'hkey'=>key\n  end\n  \n  # return\n  return record\nend\n"

#hash_has_key?(parent_pk, key) ⇒ Boolean

hash_has_key?

Returns:

  • (Boolean) 


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# File 'lib/audrey/engine/sqlite3.rb', line 564

def hash_has_key?(parent_pk, key)
  # $tm.hrm
  # puts "parent_pk: #{parent_pk}"
  # puts "key: #{key}"
  
  # prepare
  if not @preps['hash_has_key']
    sql = "    select count(*) as count\n    from relationships\n    where parent=:parent and hkey=:hkey\n    SQL\n    \n    @preps['hash_has_key'] ||= @dbh.prepare(sql)\n  end\n  \n  # get count\n  @preps['hash_has_key'].execute('parent'=>parent_pk, 'hkey'=>key).each_hash do |row|\n    return row['count'] > 0\n  end\nensure\n  @preps['hash_has_key'] and @preps['hash_has_key'].reset!\nend\n"

#hash_keys(parent_pk) ⇒ Object

hash_keys



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# File 'lib/audrey/engine/sqlite3.rb', line 751

def hash_keys(parent_pk)
  # $tm.hrm
  rv = []
  
  # prepare
  @preps['hash_keys'] ||= @dbh.prepare('select hkey from relationships where parent=:parent order by ord')
  
  # loop through records
  @preps['hash_keys'].execute('parent'=>parent_pk).each_hash do |row|
    rv.push row['hkey']
  end
  
  # return
  return rv
  
ensure
  @preps['hash_keys'] and @preps['hash_keys'].reset!
end

#import_csv(fclass, path, opts = {}) ⇒ Object

import_csv



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# File 'lib/audrey/engine/sqlite3.rb', line 1007

def import_csv(fclass, path, opts={})
  # $tm.hrm
  return Audrey::Engine::SQLite3::Importer::CSV.new(self, fclass, path, opts={})
end

#in_transaction? ⇒ Boolean

in_transaction?

Returns:

  • (Boolean) 


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# File 'lib/audrey/engine/sqlite3.rb', line 107

def in_transaction?
  # loop through transactions
  @transactions.each do |tr|
    tr.is_a?(Audrey::Engine::SQLite3::Transaction::RC) and return true
  end
  
  # else not in transaction
  return false
end

#insert_object(object, opts = {}) ⇒ Object

insert_object



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# File 'lib/audrey/engine/sqlite3.rb', line 374

def insert_object(object, opts={})
  # $tm.hrm
  
  # pk
  pk = opts['pk'] || Audrey::Util.uuid
  
  # if scalar
  if dfn = Audrey::Engine::SQLite3::RUBY_SCALAR_TO_SQLITE[object.class]
    if not @preps['insert_scalar']
      sql = "      insert into objects(pk, partition, bclass, fclass, scalar)\n      values(:pk, :partition, :bclass, :fclass, :scalar)\n      SQL\n      \n      @preps['insert_scalar'] = @dbh.prepare(sql)\n    end\n    \n    # insert record\n    simple_exec(\n      @preps['insert_scalar'],\n      'pk' => pk,\n      'partition' => @partition,\n      'bclass' => dfn['fclass'].bclass.to_s,\n      'fclass' => dfn['fclass'].to_s,\n      'scalar' => dfn['to_db'].call(object)\n    );\n    \n  # if hash or array\n  elsif dfn = Audrey::RUBY_OBJECT_TO_AUDREY[object.class] and dfn['nclass']\n    simple_exec(\n      prepare_insert_collection(),\n      'pk' => pk,\n      'partition' => @partition,\n      'bclass' => dfn['fclass'].bclass.to_s,\n      'fclass' => dfn['fclass'].to_s\n    );\n    \n  # if custom object\n  elsif object.is_a?(Audrey::Object::Custom)\n    simple_exec(\n      prepare_insert_collection(),\n      'pk' => pk,\n      'partition' => @partition,\n      'bclass' => object.class.bclass.to_s,\n      'fclass' => object.class.to_s,\n    );\n    \n  # else unknown\n  else\n    raise 'unknown-object-class: ' + object.class.to_s\n  end\n  \n  # return pk\n  return pk\nend\n"

#object_exists?(pk) ⇒ Boolean

object_exists?

Returns:

  • (Boolean) 


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# File 'lib/audrey/engine/sqlite3.rb', line 929

def object_exists?(pk)
  # $tm.hrm
  
  # ensure statement handle
  if not @preps['object_exists']
    sql = "    select count(*) as count\n    from objects\n    where\n    pk=:pk and\n    partition=:partition\n    SQL\n    \n    @preps['object_exists'] = @dbh.prepare(sql)\n  end\n  \n  @preps['object_exists'].execute('pk'=>pk, 'partition'=>@partition).each do |row|\n    return row['count'] > 0\n  end\nensure\n  @preps['object_exists'] and @preps['object_exists'].reset!\nend\n"

#purge ⇒ Object

purge



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# File 'lib/audrey/engine/sqlite3.rb', line 346

def purge
  # $tm.hrm
  
  if @mode.write
    sql = 'delete from objects where pk in (select pk from fco_not_traced)'
    @dbh.execute sql
  end
end

#q0(p_fquery) ⇒ Object

q0



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# File 'lib/audrey/engine/sqlite3.rb', line 995

def q0(p_fquery)
  require 'audrey/engine/sqlite3/query/q0'
  return Audrey::Engine::SQLite3::Query::Q0.new(self, p_fquery)
end

#reset_savepoints(ftr) ⇒ Object

reset_savepoints



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# File 'lib/audrey/engine/sqlite3.rb', line 169

def reset_savepoints(ftr)
  found = false
  
  @transactions.each do |tr|
    if tr == ftr
      found = true
    end
    
    if found
      tr.start
    end
  end
end

#rollback ⇒ Object 



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# File 'lib/audrey/engine/sqlite3.rb', line 96

def rollback
  return @transactions[0].rollback
end

#root_pk ⇒ Object

root_pk



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# File 'lib/audrey/engine/sqlite3.rb', line 362

def root_pk
  sql = 'select pk from objects where root and partition=:partition'
  return @dbh.get_first_value(sql, 'partition'=>@partition)
end

#row_by_array_index(parent_pk, idx) ⇒ Object

row_by_array_index



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# File 'lib/audrey/engine/sqlite3.rb', line 690

def row_by_array_index(parent_pk, idx)
  # $tm.hrm
  
  # ensure statement handle
  if not @preps['row_by_array_index']
    sql = "    select r.ord as ord, o.*\n    from relationships r, objects o\n    where r.parent=:parent and o.pk=r.child\n    order by r.ord\n    limit 1\n    offset :offset\n    SQL\n    \n    @preps['row_by_array_index'] = @dbh.prepare(sql)\n  end\n  \n  # get record\n  @preps['row_by_array_index'].execute('parent'=>parent_pk, 'offset'=>idx).each_hash do |row|\n    return self.class.set_row_scalar(row.to_h)\n  end\n  \n  # else return nil\n  return nil\nensure\n  @preps['row_by_array_index'] and @preps['row_by_array_index'].reset!\nend\n"

#row_by_pk(pk) ⇒ Object

row_by_pk



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# File 'lib/audrey/engine/sqlite3.rb', line 665

def row_by_pk(pk)
  # $tm.hrm
  
  # ensure prepared statement
  @preps['row_by_pk'] ||= @dbh.prepare('select * from objects where pk=:pk and partition=:partition')
  
  # get record
  @preps['row_by_pk'].execute('pk'=>pk, 'partition'=>@partition).each_hash do |row|
    return self.class.set_row_scalar(row.to_h)
  end
  
  # didn't find the object, so return nil
  return nil
  
ensure
  @preps['row_by_pk'] and @preps['row_by_pk'].reset!
end

#row_hash_by_key(parent_pk, hkey) ⇒ Object

row_hash_by_key



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# File 'lib/audrey/engine/sqlite3.rb', line 596

def row_hash_by_key(parent_pk, hkey)
  # $tm.hrm
  
  # ensure statement handle
  if not @preps['row_hash_by_key']
    sql = "    select * from objects\n    where pk =\n      (select child from relationships where parent=:parent and hkey=:hkey) and\n      partition=:partition\n    SQL\n    \n    @preps['row_hash_by_key'] = @dbh.prepare(sql)\n  end\n  \n  # params\n  params = {}\n  params['parent'] = parent_pk\n  params['hkey'] = hkey\n  params['partition'] = @partition\n  \n  # get record\n  @preps['row_hash_by_key'].execute(params).each_hash do |row|\n    return self.class.set_row_scalar(row.to_h)\n  end\n  \nensure\n  @preps['row_hash_by_key'] and @preps['row_hash_by_key'].reset!\nend\n"

#transaction(opts = {}) ⇒ Object

transaction



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# File 'lib/audrey/engine/sqlite3.rb', line 124

def transaction(opts={})
  # $tm.hrm
  tr = Audrey::Engine::SQLite3::Transaction::RC.new(self)
  @transactions.push tr
  
  # block
  if block_given?
    begin
      # yield
      yield tr
      
      # autocommit if necessary
      if opts['autocommit']
        tr.commit
      end
    
    # exit transaction
    rescue Audrey::Exception::TransactionExit => e
      unless e.tr == tr
        raise e
      end
      
      # return out of this method
      return nil
    ensure
      tr.terminate
      @transactions.pop
    end
    
    # return nil
    return nil
  
  # non-block
  else
    return tr
  end
end